21879715

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{431}}^1$

素因数の和:531

約数の個数: 32

約数和(自身を含む): 31352832

約数和(自身を除く): 9473117

約数列:

[1, 5, 11, 13, 55, 65, 71, 143, 355, 431, 715, 781, 923, 2155, 3905, 4615, 4741, 5603, 10153, 23705, 28015, 30601, 50765, 61633, 153005, 308165, 336611, 397813, 1683055, 1989065, 4375943, 21879715]

約数ペア:

[(1, 21879715), (5, 4375943), (11, 1989065), (13, 1683055), (55, 397813), (65, 336611), (71, 308165), (143, 153005), (355, 61633), (431, 50765), (715, 30601), (781, 28015), (923, 23705), (2155, 10153), (3905, 5603), (4615, 4741)]